This view from NASA's Cassini spacecraft features a blue planet, Uranus, imaged by Cassini for the first time. Uranus is a pale blue in this natural color image because its visible atmosphere contains methane gas and few aerosols or clouds.

These two pictures of Uranus were compiled from images recorded by NASA's Voyager 2 on Jan. 1O, 1986. This view is toward the planet's pole of rotation, which lies just left of center. The image on the right is a false-color image.

These three NASA Hubble Space Telescope images of the planet Uranus reveal the motion of a pair of bright clouds in the planet's southern hemisphere, and a high altitude haze that forms a 'cap' above the planet's south pole.

NASA's Hubble Space Telescope peered deep into Uranus' atmosphere to see clear and hazy layers created by a mixture of gases. Using infrared filters, Hubble captured detailed features of three layers of Uranus' atmosphere.

This view of pale blue-green Uranus was recorded by NASA's Voyager 2 on Jan 25, 1986, as the spacecraft left the planet behind. The thin crescent of Uranus is seen here between the spacecraft, the planet and the Sun.